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Problems associated with using filtration to define dissolved trace element concentrations in natural water samples

Environmental Science and Technology

By:
, , , , , and
DOI: 10.1021/es950407h

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Abstract

Field and laboratory experiments indicate that a number of factors associated with filtration other than just pore size (e.g., diameter, manufacturer, volume of sample processed, amount of suspended sediment in the sample) can produce significant variations in the 'dissolved' concentrations of such elements as Fe, Al, Cu, Zn, Pb, Co, and Ni. The bulk of these variations result from the inclusion/exclusion of colloidally associated trace elements in the filtrate, although dilution and sorption/desorption from filters also may be factors. Thus, dissolved trace element concentrations quantitated by analyzing filtrates generated by processing whole water through similar pore-sized filters may not be equal or comparable. As such, simple filtration of unspecified volumes of natural water through unspecified 0.45-??m membrane filters may no longer represent an acceptable operational definition for a number of dissolved chemical constituents.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Problems associated with using filtration to define dissolved trace element concentrations in natural water samples
Series title:
Environmental Science and Technology
DOI:
10.1021/es950407h
Volume
30
Issue:
3
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Science and Technology
First page:
954
Last page:
963
Number of Pages:
10